Wagon-scale.



No. 791,568. PATENTBD JUNE 6, 1905. B. T. MCDONALD, JR. & J. M. MODONALD.

WAGON SCALE. APPLICATION FILED JUNE 30. 1904.

3 SHEETS-SHEET 1.

No. 791,568.` PATENTED JUNE 6, 1905. B. T. MGDONALD, JR. & J. M. MGDONALD. WAGON SCALE.

APPLICATION FILED JUNE 30. 1904.

3 SHEETS-SHEET 2.

PATENTED JUNE 6, 1905. B. T. MGDONALD, lJR. & J. M. MGDONALD.

WAGON SCALE.

APPLIUATION FILED JUNI; so. 1904.

3 SHEETS-SHEET 3.

UNITED STATES APatented June 6, 1905.

PATENT OEEICE.

BENJAMIN T. MCDONALD, JR., AND JAMES M. MCDONALD, OF PLEASANT- HILL, MISSOURI.

WAGON-SCALE.

SPECIFICATION forming part of Letters Patent N- 791,568, dated June 6, 1905.

Application filed June 30,1904` Serial No. 214,793.

To (t/l w/wm t vit/.1.3; concern:

Beit known that we, BENJAMIN T. MODON- ALD, Jr., and JAMES M. MCDONALD, citizens of the United States, residing at Pleasanthill,

Cass county, Missouri, have jointly invented a certain new and useful Improvement in Tagen-Scales, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it ap- IO pertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 isa plan view, partly in horizontal section, of the working parts of our improved I5 wagon scale, the platform being omitted.

Fig. 2 is a side elevational view partly in vertical section. Fig. 3 is an enlarged vertical sectional view showing one of the end frames, rocker-shaft, and a portion of the platform.

2O Fig. 4 isa sectional view on the line 11 4 of Fig. 3. Fig. 5 is a plan view of the parts shown in Fig. 3, the top flange of the channeled end frame being cut away. Fig. 6 is a detail view of the supporting-chair and stirrup-hanger, said hanger being partly in section to show the bearing-block mounted therein. Fig. 7 is 'a sectional view on the line 7 7 of Fig. 1. Fig. 8 is a sectional view on the line 8 8 of Fig. 1. Fig. 9 is a sectional view on the line 9 9 of Fig. 1, and Fig. 10 is a bottom plan view of the end of one of the rockarms.

This invention relates to a new and useful improvement in wagon-scales of that type shown in our Patent No. 720,728, dated February 17, 1903.

The objects of this invention are to simplify the construction of the working parts of the scale and also to reduce the cost of manufacture of the same.

Vith these objects in view the invention vconsists in the construction, arrangement, and combination of the several parts of our device, all as will be hereinafter described and afterward pointed out in the claims.

In the drawings, 1 indicates the commercially-rolled channels forming the end frames, which channels are connected by pipes 2 passing through openings in the ends of the channels, said pipcs being threaded and having nuts which impinge against the inner and outer faces of the webs of the channels in order to adjust the end frames toward or from each other. These channeled end frames are provided with brackets 3, bolted thereto for securing a top-frame timber et in position. 5 indicates a supporting-chair bolted to the channeled end frame, which chair is provided with recessed lugs 6, affording seats for the stirrup-hanger 7. This stirrup-hangcr, as shown in Fig. 6, has knife-edge bearings 8 cooperating with the recessed seats 6, and in addition each stirrup-hanger is provided with an opening the bottom wall of which is provided with a pocket 9, in which is arranged a rocking bearing-block 10. This bearing-block is formed with a curved lower face, as shown, so as to rockin the pocket of the stirruphanger and in this manner accommodate itself to the load carried thereby. In addition this rocking bearing-block is provided with a rccess or seat in its upper face, which receives a knife-edge bearing on the under side of a block 11 in a lug 12, extending from a rockershaft 13. This bearing-block 11 is preferably 7 5 made of tool-steel and grooved longitudinally, as at 11, the said bearing-block being inserted in the mold at the time that the rocker-shaft and its lug are cast. Thus the metal forming the lug enters the groove and serves as a key to hold the bearing in place. The bearing is slightly tapered, so that it may be driven from the lug for the purpose of being ground and then inserted in position. In this manner the knife-edge on the bearing may be kept sharp, 35 said bearing being capable of removal for regrinding at will.

Projecting diametricall y opposite to the lug 12 is another lug, 14, (there being two such lugs 12 and 14 on each rocker-shaft,) and in 90' the lugs 14 are knife-edge bearings 15, preferably made of tool-steel and tapered so that they can be driven into and out of their openings in the lug. These bearings 15 are also preferably inserted in the mold before the lugs 111 are cast and can be removed for regrinding, as is well understood.

16 indicates a platform-joist, preferably in 18, having a recess 19 and suitable openings j for the passage of securing-bolts.

2O indicates rock-arms provided with lugs or projections fitting in the recesses 19, said rock-arms being secured in place by the bolts 21. The rock-arms 20, as shown in Fig. 1', extend toward each other, and in the end of each rock-arm is an elongated slot 22, while on the under face of each rock-arm is a seat 23.

'24 indicates a block slidingly mounted in the seat, said block having threaded engagement with a bearing-bolt 25, which projects up through the slot and passes through a suitable washer, the upper end ofsaid bolt receiving a jam-nut 26, by which it may be locked in adjusted position.

27 indicates a saddle-block having a recess in its upper face for receiving the bearing end of the bolt 25, the ends of said block 27 being recessed to receive the side members of a stirrup-loop 28. The upper end of said loop embraces a saddle-block 29, whose upper face is recessed to accommodate the loop and whose lower face is grooved to cooperate with a bearing 30 in the form of a squared shaft, preferably made of tool-steel and being mounted in the cross-lever 31. The outer end of said cross-lever coperates with a rod extending up to the scale-beam, as usual. The rod and scale-beam being of the form commonly employed in connection with platform-scales, it is not deemed necessary to illustrate them. The inner end of this cross-lever is provided with a bearing 32, preferably in the form of a squared shaft, which is seated in recesses formed in an angular extension of a casting 33, bolted to one of the platform-joists.

From the above description it will be ob vious that the platform is suspended in position, so as to freely swing upon the application of a moving load, the swinging motion of the platform being limited by the runningboards 4, which prevent too great a movement and consequently displacement of any of the parts. The shackle connection between the rock-arms and cross-lever is also such as to accommodate vibration of the platform without disturbing the relation of the parts and without interfering with the accurate weighing of the load on the platform. The rocker -bearings in the 'stirrup -hangers accommodate themselves to the knife-bearings l1 and insure a full bearing of the knife-edges 11 notwithstanding the fact that said knifeedges may not be] accurately ground.

We .are aware that minor changes in the lconstruction, arrangement, and combination -blocks carried in the pockets, and rock-shafts supported bythe rocker bearing-blocks; substantially as described.

2. In awagon-scale, the combination with supporting-chairs, stirrup-hangers in the supporting-chairs and provided -with pockets, rocker bearing-blocks in the pockets and having curved lower faces to accommodate the load, and rock-shafts carried by said rocker bearing-blocks; substantially as described.

3. In avwagon-scale, the combination with end frames, supporting-chairs having recessed lugs, stirrup-hangers carried by the recessed lugs and `provided with pockets, rockable bearing-blocks in the pockets, rock-shafts supported by the bearing-blocks and having lugs provided with knife-edges, and beams supported by the knife-edges; substantially as described.

4. In la wagon-scale, the-combination with a beam, a saddle-block 'having a recess, and a stirrup-loop for supporting the saddle-block on the beam, a rock-arm, and an adjustable device movable in the rock-arm and engaging the recess in the saddle-block; substantially as described.

5. In 'a wagon-scale, lthe combination with a frame, of rock-shafts and their rock-arms having slots, a cross-lever, a bearing 30 carried by said cross-lever, saddle-blocks 29 cooperating with said bearing,rstirrups 28 supported by said saddle-blocks, saddle-blocks 27 arranged in the lower ends of the stirrups, said last-mentioned saddle-'blocks having recessed seats in their upper faces, and bearingbolts 25 passing through the slots in the ends of the rock-arms respectively, slidingv blocks cooperating with the bearing-bolts and mounted in the seats on the under faces of the rockarms and having threaded upper ends for the reception of binding-nuts; substantially as described.

6. In a wagon-scale, the combination with end frames, supporting-chairs carried by said end frames, stirrup-hangers carried by the supporting-chairs and provided with knifeedge bearings, said stirrup-hangers having pockets, rocking bearing-blocks in the pockets whose lower faces are curved to accommodate the load, rock-shafts carried by the bearing- IOO IIO

IIS

blocks, and platform-joists supported by the rock-shafts; substantially as described.

7. In a pitless wagon-scale, the combination with end frames made of commercially-rolled channels, of castings secured to said channels and affording supports, swinging members carried by said supports, a rocker-shaft having lateral extensions on one side engaging said swinging members, lateral extensions on the opposite side of said shaft for supporting the platform, a rock-arm on the end of said shaft, and a cross-lever with which said rockarm cooperates all of the above-mentioned elements being above the horizontal plane of the bottom faces of the channel end frames; substantially as described.

8. In a pitless wagon-scale, the combination with two commercially-rolled channels forming the end members of the frame, means for connecting said channels together, castings secured to the inner faces of said channels, swinging members which are supported by said castings, rocker-shafts parallel with said end channels and provided with laterally-oxtending' projections engaging said supporting members, said rocker-shafts also being provided with oppositely-disposed projections for su pporting the platform of the scale, rockarms which are secured to said rocker-shafts and extend toward each other, and a crosslever to which said rock-arms are connected all of the above-mentioned elements being' above the horizontal plane of the bottom faces of the channel end frames; substantially as described.

9. In a wagon-scale, the combination with a lever, stirrups suspended from the lever, saddle-blocks carried by the stirrups, rock-shafts, rock-arms on the shafts and extending toward each other, the ends of said rock-arms projecting` through the stirrups, blocks slidably mounted on the rock-arms near their ends, and bearing-bolts carried by the sliding blocks and bearing upon the saddle-blocks; substantially as described.

10. In a pitless wagon-scale, the combination with end frames made of commerciallyrolled channels, the webs of the channels being' in vertical planes, of castings secured to the Webs of said channels and comprising chairs, swinging members carried by said chairs, a rocker-shaft having extensions engaging' said swing'ing' members, extensions also on said shaft for supporting the platform, a rock-arm on the end of said shaft, anda cross-lever with which said rock-arm coperates all of the above-mentioned elements be-` ing above the horizontal plane of the bottom faces of the channel end frames; substantially as described.

11. In a pitless wagon-scale, the combination with end frames made of commerciallyrolled channels, of castings secured to said channels and affording supports, swinging members carried by said supports, a rockershaft having lateral extensions on one side engaging said swinging member, lateral extensions on the other side of said shaft for supporting the platform, and platform-beams having cheek-plates engaging the last-named lateral extension all of the above-mentioned elements being above the horizontal plane of the bottom faces of the channel end frames; substantially as described.

I2. In a pitless wagon-scale, the combination with end frames made of commerciallyrolled channels with their iianges projecting inwardly, of brackets secured to the webs of said channels and affording supports, shaftsupports carried by said hangers, a rockershaft having' oppositely-disposed projections, one of which engages the shaft-support, and a floor-beam engaging the opposite projection all of the above-mentioned elements being' above the horizontal plane of the bottom faces of the channel end frames; substantially as described.

13. In a pitless wagon-scale, the combination with end frames comprising commercially-rolled channels, of brackets secured to said channels and affording supports, swinging shaft-supports carried by said brackets, shafts engaging said supports, and platformbeams supported by the shafts all of the abovementioned elements being above the horizon.- tal plane of the bottom .faces of the channel end frames; substantially as described.

In testimony whereof we hereunto aflix our signatures, in the presence of two witnesses, this 27 th day of June, 1904.

BENJAMIN T. MUDONALD, JR. JAMES M. MUDONALD.

Witnesses:

W. IV. MASON, A. R. VVIHERRITT. 

